package cn.fengzhilun.javase.day09.secend;

public abstract class Demo1 {
	
	public abstract void Demo1test();
}

  abstract class Aa{
	
	public abstract void test11();
}
  abstract class  Ba{
	  
	  public abstract void test1();
  }
 abstract  class C extends Aa{
	  
	  public abstract void c();
	  
  }